From 1c7d61f8482199388757fe4422208fb7c2bb68b9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20V=C3=A1zquez?= <alex.vazquez@unity3d.com>
Date: Tue, 7 Sep 2021 11:23:10 +0200
Subject: [PATCH] Implementing Menu Manager

---
 .../Editor/MenuManager.cs                     | 79 +++++++++++++++++++
 .../Editor/MenuManager.cs.meta                | 11 +++
 2 files changed, 90 insertions(+)
 create mode 100644 com.unity.render-pipelines.core/Editor/MenuManager.cs
 create mode 100644 com.unity.render-pipelines.core/Editor/MenuManager.cs.meta

diff --git a/com.unity.render-pipelines.core/Editor/MenuManager.cs b/com.unity.render-pipelines.core/Editor/MenuManager.cs
new file mode 100644
index 00000000000..709d1fe00c1
--- /dev/null
+++ b/com.unity.render-pipelines.core/Editor/MenuManager.cs
@@ -0,0 +1,79 @@
+using System;
+using System.Linq.Expressions;
+using System.Reflection;
+
+namespace UnityEditor.Rendering
+{
+    /// <summary>
+    /// Contains a set of method to be able to manage Menu Items for the editor
+    /// </summary>
+    static class MenuManager
+    {
+        #region Add Menu Item
+        static Action<string, string, bool, int, Action, Func<bool>> s_AddMenuItem = GetAddMenuItemMethod();
+        static Action<string, string, bool, int, Action, Func<bool>> GetAddMenuItemMethod()
+        {
+            MethodInfo addMenuItemMethodInfo = typeof(Menu).GetMethod("AddMenuItem", BindingFlags.Static | BindingFlags.NonPublic);
+            var nameParam = Expression.Parameter(typeof(string), "name");
+            var shortcutParam = Expression.Parameter(typeof(string), "shortcut");
+            var checkedParam = Expression.Parameter(typeof(bool), "checked");
+            var priorityParam = Expression.Parameter(typeof(int), "priority");
+            var executeParam = Expression.Parameter(typeof(Action), "execute");
+            var validateParam = Expression.Parameter(typeof(Func<bool>), "validate");
+
+            var addMenuItemExpressionCall = Expression.Call(null, addMenuItemMethodInfo,
+                nameParam,
+                shortcutParam,
+                checkedParam,
+                priorityParam,
+                executeParam,
+                validateParam);
+
+            return Expression.Lambda<Action<string, string, bool, int, Action, Func<bool>>>(
+                addMenuItemExpressionCall,
+                nameParam,
+                shortcutParam,
+                checkedParam,
+                priorityParam,
+                executeParam,
+                validateParam).Compile();
+        }
+
+        /// <summary>
+        /// Adds a menu Item to the editor
+        /// </summary>
+        /// <param name="path">The path to the menu item</param>
+        /// <param name="shortcut">The shortcut of the menu item</param>
+        /// <param name="checked">If the item can have an state, pressed or not</param>
+        /// <param name="priority">The priority of the menu item</param>
+        /// <param name="execute">The action that will be called once the menu item is pressed</param>
+        /// <param name="validate">The action that will be called to know if the menu itme is enabled</param>
+        public static void AddMenuItem(string path, string shortcut, bool @checked, int priority, System.Action execute, System.Func<bool> validate)
+        {
+            s_AddMenuItem(path, shortcut, @checked, priority, execute, validate);
+        }
+
+        #endregion
+
+        #region Remove Menu Item
+        static Action<string> s_RemoveMenuItem = GetRemoveMenuItemMethod();
+        static Action<string> GetRemoveMenuItemMethod()
+        {
+            MethodInfo removeMenuItemMethodInfo = typeof(Menu).GetMethod("RemoveMenuItem", BindingFlags.Static | BindingFlags.NonPublic);
+            var nameParam = Expression.Parameter(typeof(string), "name");
+            return Expression.Lambda<Action<string>>(
+                Expression.Call(null, removeMenuItemMethodInfo, nameParam),
+                nameParam).Compile();
+        }
+        #endregion
+
+        /// <summary>
+        /// Removes a Menu item from the editor, if the path is not found it does nothing
+        /// </summary>
+        /// <param name="path">The path of the menu item to be removed</param>
+        public static void RemoveMenuItem(string path)
+        {
+            s_RemoveMenuItem(path);
+        }
+    }
+}
diff --git a/com.unity.render-pipelines.core/Editor/MenuManager.cs.meta b/com.unity.render-pipelines.core/Editor/MenuManager.cs.meta
new file mode 100644
index 00000000000..ac7bdfd5ea5
--- /dev/null
+++ b/com.unity.render-pipelines.core/Editor/MenuManager.cs.meta
@@ -0,0 +1,11 @@
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